I've found that if I disable music in the game after a few turns (and/or a few alt+tabs to look at other windows) the sound effects in the game (such as end turn button, etc.) will be disabled.
If I re-enable sound and then disable it again the sound effects will come back on.
Has anyone else experienced this issue?
BTW Absolutely loving the game. Solid foundation and I can see the game is only going to continue to grow stronger.